Azo dyestuff.



UNITED STATES PATENT OFFICE oscAR 'ettNTHER AND LEOPOLD HESSE, or ELBERFELD, ARTHUR ZART, or Vol-[WIN- KEL, AND HUGO SGHWEITZER, OF ELIBEREELD, GERMANY, ASSIGNORS T O FARBEN,

FABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORA- 'ITON- OF GERMANY.

AZO DYESTUFF.

Ro'Drawing.

1 To all whom it may concern:

Be it. known that We, OSCAR Gt'iN-TIIER and Lnoronn H nssn, residing at Elberfeld, and An'rilt'n ZAR'I and HUGO Sonwnt'rznn,

5 residing, respectively, at Vohwinkel, near Elberfeld, and Elbert'eld, Germany, doctors of philosophy, chemists, citizens of the German Empire, have invented new and useful Improvements-in Dyes, of which the fol1owing is a specification. This invention relates to the preparation of new azo dyestuffs which are obtained by combining 1-11 acld solutlon the diazo compounds oi aromatic annns containing no 'nitro groups, especially anilin, ortho-chloroanilin. naphthylamius, toluidins, xylidins, aminophenol ethers aminobenzaldehyds, anthranilic acids etc.. with '2-arylamino-8 naphthol i sulfonic acids.

iihw The new dyestuffs are after being dried aitdpulverizedin the shape of their alkaline saltsllark powders; yielding upon reduction with staiinous chlorid and hydrochloric acid an aromatic aunn containing no mtro group and an l-ami110-3-arylan1ino-8-naphthol-G sulfonic acid. 'lhey produce'on wool from an acid bath from red to \lOlCl' shades 01? good iastness to light and to milling. Part 'of'the dyes can be increased in fastness by so" chroming.

I In order to illustrate the new process more fully the following example is given, the parts being by weigl1tt-1'QT.5 parts of ortho-chloro-anilin are diazotizedand the resulting di'azo compound is then added at 3 C. to a slightly acid (Congo acid) suspension, which has to be stirred of 345 parts of ii-para-anisidylamino-S-naphthol-(i-suli'onic acid. nth-1- the combination is com- 40 plete the dyestuff is converted into its sodium salt, filtered ott and dried. It is after being dried and pulverized 1n the shape of itssodunu salt a hlack-lnrmvn powder solublc in cim-centl'ated sulfuric acid with a rio-- :let-bluc color: \"leld|ng upon reduct on with stannoos (-lllfll'lll and hydrochloric acid ortho-chlot-0 2111l-lln and 1-ammo-2-para-am- Specification of Letters Patent. Application filed. June 29, 1910. Serial No. 569,489.

,sulfur'; acid with a Violet-blue color;

Patented Jan. 31, 1911 sidylamino-S-napht-hol-(i-sulfonio acid; and dyeingwool from an acid bath a bluishered fast to light and to milling. Similar shades are obtained 'on using instead of 2-paraa nisidylaminO-Smaphthol 6 sulfonic acid,

other of the above mentioned nderirativesot' :2 amino 8 naphthol 6 sulfonic acid 6. g.

paratoly xylyh, ortho-anisidyl, phenylmeta ca rboxyphenyl-2-an11no-8-n'aphth0l 6 sulfonic acid or on using instead of the above mentioned diazo compound diazo compounds of other of. the above mentioned annns.

'e claim:

, 1. The herein described new azo dyestufls acid, which dye is after being dried and pulverized in the shape of its sodiumsalt a blaclebrown powder soluble III'COIICEIlllfiiGd ing upon reduction with stannous oh-lorid and hydrochloric acid ortho-chloroanilin andl-v ammo-2 para iillisitly'lailiillo 8- naphthoh G-suliionic acid; and dyeing wool-bluislnred shades substantially as described. I

he testimony whereot' w have hereunto set our hands 'in the present-cot two sub-i scribing witnesses.

oscan GUNTHER. LnoroLn nnssn. piss. xn'rnnn zan'r. [1a. 8.1 nnoo sonwnrrznn. his

yield- 

